Quote:
Originally Posted by driftflo
you should not use an oil without fm additive in the OE diff!
you also should not use the bmw "fm booster" oil.
i suggest "castrol syntrax limited slip 75w-140". it has the right amount of fm additive in it so that the lsd can still lock.
but you cannot fight against the delay in lockup of the oe lsd with any oil.
without any fm the clutches will wear quickly and with the fm booster oil it can hardly lock properly any more.
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I can attest to this, that's what I use in my diff and seems to be working well! I believe that is the OEM fill for W204 C63s with the LSD option.